Your Computer Will Not Start: Work Through This List

A computer that will not start is alarming, but the cause is often something small. Go through these steps in order.

Check the power first

• Make sure the cable is pushed in firmly at both ends.
• Try a different socket and, if you use one, a different extension lead.
• On a desktop, check the switch at the back of the power supply is on.

Laptops

• Plug in the charger and look for a charging light.
• Hold the power button for about thirty seconds, release it, wait, then press once.
• If you can, try another compatible charger. A faulty charger is a very common cause.

Is it on but showing nothing?

Check the monitor's power and input setting, and try another cable. On a desktop with a graphics card, make sure the cable goes into the card, not the motherboard.

Remove extras

Unplug USB drives, printers and other accessories, then try again. A faulty peripheral can sometimes block start-up.

Look, listen and smell

• Do fans spin and lights come on?
• Are there beeps? Your motherboard manual lists what each pattern means.
• A burning smell means stop immediately and unplug the computer.

For confident desktop users

With the power off and unplugged, touch the metal case to discharge static, then press the memory modules firmly back into their slots and check the main power connectors.

Likely culprits

Failed power supply, loose memory, a faulty charging port or battery, a failing motherboard, or a broken power button connection.

When to call a professional

If nothing helps, take it to a repair shop. Never open a power supply, because it can hold dangerous voltage even when unplugged. Tell the technician if you need the data on the drive, since it can often be recovered.

This guide is general information, not professional advice. Menus, features and prices change between versions and regions. See our disclaimer.